Note D - Other Comprehensive Income (Loss) - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 89,856	$ 84,505	$ 88,520	$ 80,083
Balance	89,530	84,401	89,530	84,401
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(444)	(538)	(444)	(538)
OCI/OCL before reclassifications	0	0	0	0
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	0	0	0	0
Net current period OCI/OCL	0	0	0	0
Balance	(444)	(538)	(444)	(538)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	2,203	931	1,795	(23)
OCI/OCL before reclassifications	(1,173)	855	615	2,244
Amounts reclassified from OCI to Sales	(1,162)	(504)	(2,423)	(650)
Tax effect of OCI activity	523	(82)	404	(371)
Net current period OCI/OCL	(1,812)	269	(1,404)	1,223
Balance	391	1,200	391	1,200
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	485	0	348	0
OCI/OCL before reclassifications	4	62	178	62
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	(1)	0	(38)	0
Net current period OCI/OCL	3	62	140	62
Balance	488	62	488	62
AOCI Attributable to Parent [Member]
Balance	2,244	393	1,699	(561)
OCI/OCL before reclassifications	(1,169)	917	793	2,306
Amounts reclassified from OCI to Sales	(1,162)	(504)	(2,423)	(650)
Tax effect of OCI activity	522	(82)	366	(371)
Net current period OCI/OCL	(1,809)	331	(1,264)	1,285
Balance	$ 435	$ 724	$ 435	$ 724